My knowledge in marble identification is lacking but from what I may understand:

•The blue color is sitting on the surface rather than swirled internally.

•The ribbon is more like a thin strip that has an asymmetric taper (one end fading naturally, the other cut off abruptly) and doesn’t fully wrap around.

•The seam reads as a single localized crease (u-shaped), not a full equatorial belt running all the way around the marble — it shows up once as the marble turns.

Could this indicate a transitional, single-stream American marble from the 1900s–1920s? Or a Marble King/Vitro Agate from the 1940s-1970s?

I bought three bags of marbles at a yard sale for $7 each. Here's what was in the first one. These are older marbles, right?

These are marbles I had found on the ground while I would explore my neighborhood as a young kid. Near my childhood home was a glass place? I don't exactly remember, but it was easy to find these marble like things with flat bottoms and had enough tiny bubbles in them to look like it held a galaxy inside it

I have these five iridescent, multicolor marbles that I need help identifying. They are all the same size, seem to be glass and are similarly multicolored with an iridescent sheen to them like oil on water. Thanks